Features： 1、Aerobars are consist of high quality aluminum alloy handlebars, plastic elbows rests trays and Soft sponge cushions. 2、 Please measure your handlebars diameter prior to purchasing.The clamp fits handlebar with diameter from 25mm to 31.8mm (by adding or removing shims).We do advice you have the aerobars installed by a professional/people at local bike store.Set of Shims and Anti-slip tape can be applied to get aerobars tighten on your handlebars. If needed, order a roll of Hylaea Anti Slip Tape on for Amazon. 3、 With ergonomic design, it used to relax under a good road conditions in the long-distance cycling. 4、 Tri bars with connected clamps, arm pad and sponge cushion(pad and sponge cushion are removable for easy cleaning.) 5、 Multi adjustable: Independent rest and bar adjustments, bar length, bar angle, bar width, arm rest angle & placement. Specification： Material: aluminum alloy Handlebar length: 34cm/13.38inch (Approx.) Suitable for models: road group timing / iron man 3 items / mountain folding / long-distance riding Suitable for caliber: 31.8/26/25.4mm (26/25.4 requires padded semi-circular gasket, gasket double-sided serration lock to produce friction and is not easy to slip) is required for 25.4 caliber handlebars; Package List： handlebar *2 sponge pad *2 bracket *2